Stainless Steel Welded Tube A270 TP304 180 360 Grit Polished Surface for Food Beverage and Dairy Industry
Stainless Steel Welded Tube A270 TP304 180 360 Grit Polished Surface for Food Beverage and Dairy Industry
ASTM A270 TP304 Stainless Steel Sanitary Welded Tube is the ideal piping material for the food, beverage, and dairy industries. Its core advantage lies in strict compliance with sanitary standards, ensuring a smooth inner surface, no contamination, and ease of cleaning.
Product Standard & Definition
- Standard: ASTM A270. This is an ASTM international standard specifically for austenitic stainless steel sanitary tubes.
- Core Requirements: Unlike ordinary industrial pipe standards (such as ASTM A269 or A312), the A270 standard imposes stricter requirements for surface finish, cleanliness, and corrosion resistance to meet sanitary standards in the food, dairy, and pharmaceutical industries.
- Manufacturing Process: Welded. The tubes are manufactured using an automatic tungsten inert gas (TIG) welding process without the addition of filler metal. Post-weld heat treatment (solution annealing) is performed to relieve stress and restore corrosion resistance.
This specification covers grades of seamless and welded austenitic stainless steel sanitary tubing intended for use in the dairy and food industry and having special surface finishes. Pharmaceutical quality and finishes may be requested, as a supplementary requirement.
It covers tubes in sizes up to and including 4 in. (101.6 mm) in outside diameter.
| Grit | Ra (μm) | Ra (μin) | Description | Common Application |
| 180 Grit | 0.5 – 0.8 | 20 – 32 | Satin Finish | External polishing, non-product contact |
| (Matte/Non-reflective) | ||||
| 240 Grit | 0.3 – 0.5 | 12 – 20 | Standard Sanitary Finish | Standard inner surface for Food & Dairy |
| (Fine Satin) | ||||
| 320 Grit | 0.25 – 0.4 | 10 – 16 | Intermediate Finish | Medium requirement |
| 400 Grit | 0.2 – 0.3 | 8 – 12 | High Gloss / Semi-Mirror | Beverage, Beer |
| 600 Grit | 0.1 – 0.2 | 4 – 8 | Mirror Finish | High purity, Pharmaceutical, Bio-pharm |
| 800 Grit | ≤ 0.1 | ≤ 4 | Electropolished Finish | Water for Injection, Bio-reactors |
| (Often combined with mechanical polish) |
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